HERE’S THE FIRST thing I learned when riding a pair of RocketSkates: 12 mph might seem slow, but strap a pair of motorized roller skates to your feet and that speed becomes instantly terrifying.

After a quick tutorial, I donned on these hefty electric skates, pushed off, heard the motor kick in with a delightful digitized afterburner sound effect, and… then I immediately freaked out and bailed onto my toes like a chump. This happened roughly 10 times in a row. Luckily, the RocketSkates are easy to stop: You can either lean back on your heel to engage the brake, or you can simply step onto your toes like I did. The footplates of each skate end at about mid-sole, so your toes are always available for freak-out braking.
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https://www.wired.com/2014/08/acton-rocketskates/